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Comparison table of valve diameter (DN) and pipe diameter

The size of the valve caliber has an inevitable relationship with the size of the pipeline. It is usually said that the pipe diameter (outer diameter) is matched with the valve. The valve diameter needs to be calculated according to the actual parameters. Generally speaking, the pipeline will be larger, and the valve actually needs to be smaller. It mainly depends on the flow rate to be controlled by the valve position, and the pipeline size only needs the flow capacity.
(1) Comparison table of pipe fitting size and valve diameter and inches:

Diameter/inch DN (Norminal diameter) mm pipe OD (mm)
1/4 8 13.7
3/8" 10 17.14
1/2" 15 21.3
3/4" 20 26.7
1" 25 33.4
1.2" 32 42.2
1.5" 40 48.3
2" 50 60.3
2.5" 65 73
3" 80 88.9
4" 100 114.3
5" 125 141.3
6" 150 168.3
8" 200 219.1
10" 250 273
12" 300 323.8
14" 350 355.6
16" 400 406.4

(2) Valve diameter DN (nominal diameter) corresponds to the outer diameter of the pipe Ф (mm):

Norminal diameter/DN pipe OD small pipe OD big Norminal diameter/DN pipe OD small pipe OD big
15 18 22 350 360 377
20 25 27 400 406 426
25 32 34 450 457 480
32 38 42 500 508 530
40 45 48 600 610 630
50 57 60 700 720
65 73 76 800 820
80 89 89 900 920
100 108 114 1000 1020
125 133 140 1200 1220
150 159 168 1400 1420
200 219 219 1600 1620
250 273 273 1800 1820
300 324 325 2000 2020